Spectroscopy

Thermo Nicolet Nexus 670
Thermo Nicolet Nexus 670

Fourier transform infra-red

  • Identify compounds via transmission spectra in the mid-IR.
  • Measure modes include transmission, reflection, diffuse reflection and attenuated total reflection
  • Instrument: Thermo Nicolet Nexus 670
  • Spectral range: 800 cm­-1 to 4000 cm-1 (2.5 µm to 12.5 µm)

       Instructions and manuals



Time-resolved photoluminescence
Time-resolved photoluminescence

Photoluminescence

  • Measures light emission spectra upon photoexcitation
  • Discreet excitation wavelengths available in the range from 266 nm to 1050 nm
  • Temperature: 4.2 Kelvin to 300 Kelvin

Time-resolved photoluminescence

  • Measures time-resolved light emission spectra upon photoexcitation
  • Measure the lifetime of emitting states with single photon sensitivity and < 1 ns temporal resolution.
  • Several excitation wavelengths available in the range from 380 nm to 900 nm
  • Sensitivity: single photon
  • Room temperature and 77 K



Spectra-Physics Tsunami Ti:sapphire
Spectra-Physics Tsunami Ti:sapphire

Time-domain thermoreflectance

  • Femtosecond pump/probe spectroscopy
  • Observe optically-induced changes in optical properties on a 100’s of fs time-scale.
  • Main application is to study thermal properties of thin films and across interfaces
  • Instruments: Two home-built instruments, based on Spectra-Physics Tsunami ultrafast Ti:sapphire lasers
  • Wavelengths: 770 nm to 850 nm

       



Spex Triplemate, Princeton Instruments CCD
Spex Triplemate, Princeton Instruments CCD

Raman

  • Measure inelastically scattered light, which allows study of chemistry and atomic structure of materials
  • Instruments: Home-built based on a Spex Triplemate spectrometer and a Princeton Instruments liquid N­2 cooled CCD camera
  • Frequencies: 50 cm-1 – 5000 cm-1 (depending on the excitation wavelength).
  • Pump wavelengths: 488 nm, 515 nm, 532 nm, 633 nm, among others.

       Instructions and manuals


 

Sum-frequency-generation

  • Identify bonds and molecules at interfaces
  • Identify chemical bonds at buried interfaces
  • Instrument: Home-built using a Spitfire ultrafast regenerative amplifier
  • Spectral range: 2.5 µm to 20 µm



Varian/Cary 5 G
Varian/Cary 5 G

Transient absorption

  • Measures dynamic changes in the absorbance/transmittance caused by light excitation as a function of time after the excitation and wavelength
  • Instrument: Home-built using a Spitfire ultrafast regenerative amplifier and a twin OPA

Spectrophotometry

  • Transmission and reflection spectroscopy in the UV, visible, and near-IR (190 nm to 3300 nm)
  • Modes of measurement include transmission, absolute specular reflection, integrated total fluorescence, diffuse transmission (190 nm to 2500 nm), diffuse reflection, and combined diffuse reflection and transmission (190 nm to 2500 nm)
  • Instruments: Varian Cary 5 G and Agilent Cary 5000
  • Transmission of liquid samples can be measured between 0°C and 100°C (273 K to 373 K)

       Instructions and manuals